Uzumaki Nanao was born and raised to be a sacrifice. For generations, the Uzumaki family has maintained a covenant with the serpent god Daija, offering a family member every 111 years to ensure the clan's prosperity. Nanao, trained from childhood in music, dance, and etiquette to be the perfect offering, arrives at the god's shrine on the day of the contract renewal, fully prepared to be devoured. However, Daija has long since abandoned his divine duties and now lives as a recluse, fully immersed in the comforts of human modern life. He refuses the offering outright, telling Nanao there is no need for a sacrifice.

Rejected but undeterred, Nanao refuses to leave. His entire identity has been built around fulfilling this role, and he cannot accept the god's dismissal. He begins a persistent, often comedic campaign to convince Daija to eat him. Daija, grumpy, socially awkward, and genuinely uninterested in consuming anyone, finds himself increasingly unable to ignore the earnest and strangely endearing human who keeps showing up.

As the two spend time together, their relationship shifts from a battle of wills to a slow-building connection. Daija's cold exterior cracks, and he begins to care for Nanao in his own quiet, fumbling way. Nanao, in turn, discovers that his purpose may not lie solely in being consumed. The household grows more chaotic with the arrival of other serpentine characters, including Daija's older brother, the white snake, and several subordinates like vipers, who bring their own dynamics and complications.

Notable narrative arcs include Nanao's repeated attempts to be eaten, each more creative than the last; Daija's struggle to reconcile his godly nature with his emerging romantic feelings; and the exploration of what it means to be a sacrifice when the god no longer wants one. The story balances comedic misunderstandings with tender, romantic moments, set against a backdrop of modern supernatural domesticity where ancient tradition clashes with a lazy god's preference for takeout and video games.